Maintenance

Line and periodic maintenance.

Aircraft ground servicing. [Line Maintenance Checks] [Ground Servicing] [Periodical Scheduled Maintenance Checks]

The Tu 204-120 is designed to be inherently reliable with

• Redundancy of systems and equipment
• High standards of reliability and durability built-in to the component parts of the aircraft systems.
• All systems and equipment designed to be accessible, easily removed and readily interchangeable with spare units. 

The aircrafts key functional systems - flight navigation, engines and APU - are equipped with built-in test equipment (BITE) for ready isolation of failures. Annunciation of system status and caution/warning information is presented on the two central displays located in the pilots central instrument panel. Relevant flight information is stored in the quick access flight maintenance recorder for use in the 'condition monitored' maintenance programmer. During line maintenance the 'Quick Access' recorder system is used to monitor the current status of the aircraft based on in-flight monitoring of the flight/operational envelope, the engines and the other key systems and equipment. Fuelling is produced through a single point connector аt a pressure 4.5 kg/cm2. Refueling delivery rate is 3000 liters/minute (790 US gallons/minute). 

Cabin pressurization is provided by air bled from the high pressure compressors on each engines and passed through two Hamilton Standard air cycle cooling packs. In the event of a failure in one unit the other will compensate automatically for the reduced flow rate. Cabin pressure is maintained at a set level by two digital electronic pressurization controllers. 

An emergency oxygen system is provided for use in the unlikely event of a severe cabin de-pressurization. This consists of independent chemical oxygen generator systems for the passengers and cabin crew and a dedicated bottled oxygen supply for the cockpit flight crew. Cabin heat and sound insulation is achieved through a two-phase system. Firstly a glass fiber lining contained within impermeable dust and moisture/vapour barriers is incorporated within the fuselage skin. The whole fuselage is then lined with semi-rigid, foil coated, foamed plastic panels which are bonded to the airframe structure. To ensure adequate control of condensation on the inner fuselage skin, drain valves are fitted at the bottom of the fuselage and the insulation geometry is formed to channel fluids to these valves. The potable water supply system is fitted with a single point filler. The total capacity of the water system is 175 liters. 

The aircraft is equipped with a ring main vacuum system for waste disposal with replenishment and servicing through a standard connector. 

Total time for ground servicing of passenger plane is 30 minutes, for cargo - 18 minutes.

Line Maintenance Checks

• Ground Servicing: Reception, Parking or Departure operations.

• Check A1 (transit); - 30 min.

• Check A2 (50 fl. h.); - 2 men x 1 hour (2 menhour)

• Check A3 (100 fl. h.); - 5 men x 8 hours (40 menhour)

Aircraft is ready for flight after departure operations if:

• Check A1 is performed for transit landing duration less than 30 minutes; check A1 should be substituted by A2-check every 50 flight hours or by A3-check every 100 flight hours

• or: Parking operations were performed followed by A1 (or A2 or A3 checks) if parking time is less than 12 hours

• or: Check A1 (or A2 or A3) is performed followed by parking operations then A1 check again if parking time is more than 12 hours.

Ground Servicing

• Rapid Aircraft Turn-Around
• International ground equipment compatibility
• Standard Service Points fully accessible with minimum ground equipment
• Built-In-Test Equipment and Fault Identification for Efficient Line Maintenance
  

Periodical Scheduled Maintenance Checks

Operation is conducted "on system condition" bases

Calendar life: 20 year    Number of flight: 45000    Total service life in Flight hours: 60000

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